Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 112

When she and Lu Chuan were moving the corpse, Shen Yan found that the corpse had softened and thawed.

But it's still a long way from being able to perform an autopsy.

There are strict procedures for autopsy.

Contrary to what most people think, when dissecting a corpse, you can't just think that there is a problem, just cut it open and have a look.

Anatomy is in strict order.

Starting from the inspection of the wounds on the surface of the corpse, it is necessary to fill in the autopsy report form.

Some are similar to customized template suits, from the position of the knife, the order of dissection, toxicology and pathology experiments, etc., from top to bottom, from outside to inside.

Although Lu Chuan is not a forensic doctor, he has some basic knowledge of anatomy.

After returning the body to a lying position with Shen Yan, Lu Chuan and Shen Yan left together.

Today, most of the work is focused on visiting and investigating crime scenes.

It is imperative to confirm the identity of the deceased

The action group Sun Jun and others were responsible for following up the scene, and the second group Ren Qiang was busy with a robbery case, so Zhang Hui had to bring an auxiliary police officer to participate in the investigation of the surveillance video.

There are only some old residential areas near the construction site of Qinghe Playground, and there are very few monitoring facilities. When the playground was built, it was almost demolished.

Within the scope of inspection, only the monitoring at the main entrance of the construction site is working normally.

But obviously, the murderer didn't carry the body through the main entrance, and the monitoring basically found nothing.

After Lu Chuan completed the collection of trace evidence, there is still new work to follow up.

Around the murder scene, a radius of one kilometer, especially the physical evidence found inside and outside the wall, were all brought back.

Including but not limited to mineral water bottles, cigarette cases, cigarette butts, lighters, yogurt bottles, plastic bags, toilet paper, etc.

Although it is impossible for these things to be left behind by the murderer, if they are not in order, there may be items left by the murderer.

Maybe it wasn't left by the corpse thrown in the early morning, but since the murderer chose this place to throw the body, it shows that the murderer is familiar with the vicinity of the construction site of Qinghe Playground.

Now that you are familiar with it, you may have been here more than once.

What Lu Chuan is doing now is to collect fingerprints and DNA samples from all the physical evidence found.

In terms of fingerprint collection, Lu Chuan has great confidence and adopts different methods for different samples. Lu Chuan, who has mastered intermediate fingerprint collection skills, can be said to be easy to grasp.

A little more troublesome is the collection of DNA samples.

Generally speaking, the collection of DNA samples includes blood stain sampling, hair sampling, nail sampling, cigarette butt sampling, oral swab sampling, toothbrush sampling, semen spot sampling, and chewing gum sampling.

Each sampling method has different requirements.

What you see in TV dramas, where you can extract DNA information by simply swabbing it with a cotton swab, is mostly a joke.

Like hair sampling, generally speaking, to ensure some successful hair DNA collection, you need at least five hairs with clear follicles.

And the freshly plucked hair should be dried on a clean white paper for a few minutes before being put into the bag.

Clipped, broken hair is not acceptable.

Another example is oral swab sampling. It is necessary to rinse the mouth of the subject with clean water to ensure that there is no food residue in the mouth.

Afterwards, use a medical cotton swab to wipe repeatedly at least 30 times on the inner cheeks of the mouth.

There are still steps in the back. Put the cotton swab in a clean place to dry in the shade. It cannot be dried in the sun, blown dry with a hair dryer, or air-dried.

Finally, use the same method to collect at least three cotton swabs to ensure a successful DNA information test.

Therefore, for the items found around the scene, DNA information can be collected, which is definitely a very small number of samples.

Lu Chuan sorted out the items carefully, inspected them one by one, and then dried them in the shade and packaged them.

A hundred evidence bags are enough for Lu Chuan to work all night.

Fortunately, the current survey office is well staffed. Lu Chuan is sorting out the physical evidence, and Yang Sen is starting to pre-process the test materials collected by Lu Chuan, preparing to use instruments for experiments.

Lao Bai was not idle either. After Lu Chuan processed the physical evidence, he would continue to number them, process the corresponding document information, and create the physical evidence of the case.

This is the cumbersomeness of the murder case. Every detail must be completed in accordance with the most stringent standards and procedures without missing a step.

Even if it is an insignificant screw, as long as it appears at the murder scene, it has to be taken back, and it can only be released after several rounds of on-site inspection until the case is solved.

Of course, not all homicide cases can be solved. If it becomes a backlog, it will be uncovered and chewed again after a year or two until the case is solved.

If you don't solve the case...just do it again.

The cycle goes back and forth, lingering and pathos, life and death depend on each other, never ending.

Eleven sixteen in the evening.

"Brother Yang, you go back first, there aren't many things left, I'll just keep an eye on it."

Yang Sen's family has a son who is going to take the college entrance examination, and Lao Bai is getting old. Lu Chuan has shown his due responsibility for things like staying up late.

Yang Sen looked at the time, straightened his waist, took a breath, and took out two soft Zhonghua on the table, one for himself and one for Lao Bai.

He didn't give it to Lu Chuan, because he had observed many times that Lu Chuan's so-called smoking was to hold it in his hand after lighting it up.

Occasionally taking two sips is also a pass in the mouth.

As an old smoker, Yang Sen can tell whether the breath is inhaled into the lung cavity by smelling it, and he doesn't need to see whether the color of the smoke is light blue or light gray.

Lao Bai took the cigarette: "Can you do it alone?"

"No problem, just these things, and it will be over in an hour or two."

After chatting for a while, Yang Sen and Lao Bai withdrew first.

Liu Guodong still didn't come back from the conference room on the first floor. Lu Chuan sighed, knowing that the case was not going well.

A day later, the identity of the deceased is still not determined.

Fingerprint comparison has no results, DNA information comparison has no results, and missing persons comparison has no results yet.

Not long after the two left, Liu Guodong entered the laboratory with a tired face.

"Old Bai and the others are back?"

Lu Chuan nodded, and handed Liu Guodong some tea: "I just left for a while, and there are not many things left, and I can finish it in more than an hour, and the results will be available tomorrow morning."

Liu Guodong nodded: "You can come back later, I'll watch over here."

"Master, it's better to go home. I'm fine when I go home. I'll sleep in the office today."

Liu Guodong shook his head: "I'm not going back either, my wife and children are asleep at this point, I'll wake them up again when I go back."

The two chatted for a while, and the work in Lu Chuan's hands was completed.

120 six pieces of physical evidence, all fingerprints and DNA samples were collected.

All that is left is to compare and analyze.

But it is definitely too late tonight, and both tasks need to be advanced tomorrow.

Liu Guodong slept on the sofa, and Lu Chuan moved the camp bed.

In fact, the Criminal Investigation Detachment has dormitories, but they are basically allocated to single dogs. There are only two or three rooms for emergency, and the leaders can't sleep enough.

Bang bang bang!
Lu Chuan and Liu Guodong were awakened by the sound of the door being slammed.

It was Zhang Hui who smashed the door.

"Brother Hui, what's wrong?"

Sleepy-eyed Lu Chuan checked the time, and it was less than 06:30 in the morning.

The two didn't go to bed until after two o'clock last night, and only rested for more than four hours. Liu Guodong was too old to stay up late, and his eyes were bloodshot.

Zhang Hui, who opened the door, had an extremely ugly face: "Something happened again!"

(End of this chapter)